Ava the Postie delivers a parcel to Professor Millie that's come all the way from space. Millie's delivery of space dust makes her latest invention, a space disco, look out of this world. Ava's got a space delivery for Greengrocer Yusuf too. It's a bag of spaceberries - delicious fruits from outer space that glow in the dark. Hidden inside the bag is a little star that looks very sad, and Yusuf wonders what he can do to cheer the star up.